{"id":"flame-spread","license":"CC-BY-4.0","data":{"term":"flame spread","shortDef":"How far flame travels across a specimen in ASTM E84. An index is not a Class A roof and is not noncombustible. Oregon ignition-resistant uses an extended run.","alsoCalled":["flame spread index"],"relatedGlossary":["ignition-resistant","noncombustible","test-method"],"relatedCategories":["siding"],"relatedStandards":["astm-e84"],"relatedGuides":["ignition-resistant-vs-noncombustible"],"author":"grayson-graham","reviewStatus":"draft","lastVerified":"2026-08-23T00:00:00.000Z"}}